U.S. patent application number 16/048151 was filed with the patent office on 2019-07-25 for pad and film attaching method using the same.
The applicant listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Byoung Yul SHIM.
Application Number | 20190227596 16/048151 |
Document ID | / |
Family ID | 67298621 |
Filed Date | 2019-07-25 |
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United States Patent
Application |
20190227596 |
Kind Code |
A1 |
SHIM; Byoung Yul |
July 25, 2019 |
PAD AND FILM ATTACHING METHOD USING THE SAME
Abstract
An exemplary embodiment of the present inventive concept
provides a pad including: a flat portion; and corner portions,
wherein the corner portions may be positioned at four corners of
the pad, and hardness of the corner portions may be greater than
that of the flat portion.
Inventors: |
SHIM; Byoung Yul;
(Hwaseong-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-Si |
|
KR |
|
|
Family ID: |
67298621 |
Appl. No.: |
16/048151 |
Filed: |
July 27, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B32B 2307/536 20130101;
B32B 2457/20 20130101; B32B 3/02 20130101; B32B 2250/02 20130101;
B32B 7/12 20130101; B32B 17/10 20130101; G06F 1/1628 20130101; G06F
1/1633 20130101 |
International
Class: |
G06F 1/16 20060101
G06F001/16; B32B 17/10 20060101 B32B017/10; B32B 7/12 20060101
B32B007/12 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 25, 2018 |
KR |
10-2018-0009475 |
Claims
1. A pad comprising: a flat portion; and corner portions, wherein
the corner portions are positioned at four corners of the pad and
hardness of the corner portions is greater than that of the flat
portion.
2. The pad of claim 1, wherein the hardness is Shore Hardness and
the Shore Hardness of the corner portion is 1.1 to 7 times greater
than that of the flat portion.
3. The pad of claim 2, wherein the Shore Hardness of the flat
portion is 5 to 25.
4. The pad of claim 2, wherein the Shore Hardness of the corner
portion is 25 to 35.
5. A pad comprising: a flat portion; and corner portions, wherein
the corner portions are positioned at four corners of the pad, and
the corner portions protrude more than the flat portion.
6. The pad of claim 5, wherein a thickness of the corner portions
is 1.05 to 1.5 times greater than that of the flat portion.
7. The pad of claim 5, wherein hardness of the corner portion is
greater than that of the flat portion.
8. A film attaching method, comprising: preparing a pad provided
with a flat portion and a corner portion; sequentially positioning
a film and a cover glass on the pad; and pressing the pad to attach
the film to the cover glass, wherein hardness of the corner portion
of the pad is greater than that of the flat portion, or the corner
portion of the pad protrudes more than the flat portion.
9. The film attaching method of claim 8, wherein the hardness is
Shore Hardness, and the Shore Hardness of the corner portion is 1.1
to 7 times greater than that of the flat portion.
10. The film attaching method of claim 9, wherein the Shore
Hardness of the flat portion is 5 to 25.
11. The film attaching method of claim 9, wherein the Shore
Hardness of the corner portion is 25 to 35.
12. The film attaching method of claim 8, wherein the corner
portion protrudes more than the flat portion, and a thickness of
the corner portion is 1.05 to 1.5 times greater than that of the
flat portion.
13. The film attaching method of claim 8, wherein four edges of the
cover glass are not parallel to the flat portion.
14. The film attaching method of claim 13, wherein an angle at
which one or more sides of the cover glass are bent is 90 degrees
or more with respect to an imaginary straight line perpendicular to
the flat portion.
15. The film attaching method of claim 8, wherein at least one
corner portion of the cover glass has multiple curvatures.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to and the benefit of
Korean Patent Application No. 10-2018-0009475 filed in the Korean
Intellectual Property Office on Jan. 25, 2018, the entire contents
of which are incorporated herein by reference.
BACKGROUND
(a) Technical Field
[0002] The present disclosure relates to a pad and a film attaching
method using the same, and more particularly, to a pad having
different hardnesses or thicknesses in different areas and to a
film attaching method using the same.
(b) Description of the Related Art
[0003] Recently, a flexible display device having a light weight,
strong impact resistance, and a flexible substrate made of a
material such as plastic has been developed. The flexible display
device may be folded or rolled to facilitate portability, and thus
may be utilized in various fields.
[0004] The flexible display device includes display elements formed
on a flexible substrate. The display elements that may be used for
the flexible display device include an organic light emitting
display element, a liquid crystal display element, and the
like.
[0005] These display elements commonly include thin film
transistors. Accordingly, the flexible substrate undergoes several
thin film processes. After the thin film processes, the flexible
substrate is sealed by an encapsulation layer. The flexible
substrate, the thin film transistors formed on the flexible
substrate, and the encapsulation layer form a display panel of the
display device.
[0006] Generally, a cover window for protecting the display panel
is attached to a front surface of the display panel. In this case,
a bonding agent is interposed between the display panel and the
cover window to bond the display panel and the cover window
together.
[0007] In addition, recently, a side-view display device including
a main display area in which a main image is displayed and an
auxiliary display area in which a sub-image is displayed on a bent
side has been developed. A cover window of the side-view display
device has a side bending structure in which a side portion is
bent. Bubble defects in which bubbles are interposed between the
cover window and a film may occur during a process of attaching the
film or the like to a rear surface of the cover window having the
side bending structure.
[0008] The above information disclosed in this Background section
is only for enhancement of understanding of the background of the
inventive concept and therefore it may contain information that
does not form the prior art that is already known in this country
to a person of ordinary skill in the art.
SUMMARY
[0009] The present inventive concept has been made in an effort to
provide a pad that may allow a film to be attached to a cover glass
with multiple curvatures without lifting, and a film attaching
method using the same.
[0010] An exemplary embodiment of the present inventive concept
provides a pad including: a flat portion; and corner portions,
wherein the corner portions may be positioned at four corners of
the pad, and hardness of the corner portions may be greater than
that of the flat portion.
[0011] The hardness is Shore Hardness. The Shore hardness of the
corner portion may be 1.1 to 7 times greater than that of the flat
portion.
[0012] The Shore Hardness of the flat portion may be 5 to 25.
[0013] The Shore Hardness of the corner portion may be 25 to
35.
[0014] Another exemplary embodiment of the present inventive
concept provides a pad including: a flat portion; and corner
portions, wherein the corner portions may be positioned at four
corners of the pad, and the corner portions may protrude more than
the flat portion.
[0015] A thickness of the corner portions may be 1.05 to 1.5 times
greater than that of the flat portion.
[0016] Hardness of the corner portions may be greater than that of
the flat portion.
[0017] Another embodiment of the present inventive concept provides
a film attaching method, including: preparing a pad provided with a
flat portion and a corner portion; sequentially positioning a film
and a cover glass on the pad; and pressing the pad to attach the
film to the cover glass, wherein hardness of the corner portion of
the pad may be greater than that of the flat portion, or the corner
portion of the pad may protrude more than the flat portion.
[0018] The hardness is Shore Hardness. The Shore hardness of the
corner portion may be greater than that of the flat portion, and
the shore hardness of the corner portion may be 1.1 to 7 times
greater than that of the flat portion.
[0019] The Shore Hardness of the flat portion may be 5 to 25.
[0020] The Shore Hardness of the corner portion may be 25 to
35.
[0021] The corner portion may protrude more than the flat portion,
and a thickness of the corner portion may be 1.05 to 1.5 times
greater than that of the flat portion.
[0022] Four edges of the cover glass may not be parallel to the
flat portion.
[0023] An angle at which one or more sides of the cover glass are
bent may be 90 degrees or more with respect to an imaginary
straight line perpendicular to the flat portion.
[0024] At least one corner portion of the cover glass may have
multiple curvatures.
[0025] According to the exemplary embodiments, it is possible to
provide a pad that may allow a film to be attached to a cover glass
with multiple curvatures without lifting, and to a film attaching
method using the same.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 illustrates a pad according to an exemplary
embodiment of the present inventive concept.
[0027] FIG. 2 illustrates a cover glass of which all four sides are
curved according to an exemplary embodiment of the present
inventive concept.
[0028] FIG. 3 illustrates a cross-sectional view taken along line
A-A' of the cover glass of FIG. 2.
[0029] FIG. 4 illustrates a cross-sectional view taken along line
B-B' of the cover glass of FIG. 2.
[0030] FIG. 5 illustrates deformation of a film which occurs during
a process of attaching the film to a cover glass.
[0031] FIG. 6 illustrates a pad according to another exemplary
embodiment of the present inventive concept.
[0032] FIG. 7 illustrates a cross-sectional view taken along line
VII-VII of the pad of FIG. 6.
[0033] FIG. 8, FIG. 9, FIG. 10, FIG. 11, and FIG. 12 illustrate
cross-sectional views of a film attaching process according to an
exemplary embodiment of the present inventive concept.
[0034] FIG. 13 illustrates a display device according to an
exemplary embodiment of the present inventive concept.
[0035] FIG. 14 illustrates only a cover glass in a display device
according to an exemplary embodiment of the present inventive
concept.
[0036] FIG. 15 illustrates a cross-sectional view of the cover
glass of FIG. 14 in a first direction.
[0037] FIG. 16 illustrates a cross-sectional view of the cover
glass of FIG. 14 in a second direction.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0038] The present inventive concept will be described more fully
hereinafter with reference to the accompanying drawings, in which
exemplary embodiments of the inventive concept are shown. As those
skilled in the art would realize, the described embodiments may be
modified in various different ways, all without departing from the
spirit or scope of the present disclosure.
[0039] Parts that are irrelevant to the description will be omitted
to clearly describe the present disclosure, and like reference
numerals designate like elements throughout the specification.
[0040] Further, in the drawings, the size and thickness of each
element are arbitrarily illustrated for ease of description, and
the present disclosure is not necessarily limited to those
illustrated in the drawings. In the drawings, the thicknesses of
layers, films, panels, areas, etc. are exaggerated for clarity. In
the drawings, for ease of description, the thicknesses of some
layers and areas are exaggerated.
[0041] It will be understood that when an element such as a layer,
film, area, or substrate is referred to as being "on" another
element, it can be directly on the other element or intervening
elements may also be present. In contrast, when an element is
referred to as being "directly on" another element, there are no
intervening elements present. Further, in the specification, the
word "on" or "above" means positioned on or below the object
portion, and does not necessarily mean positioned on the upper side
of the object portion based on a gravitational direction.
[0042] In addition, unless explicitly described to the contrary,
the word "comprise" and variations such as "comprises" or
"comprising" will be understood to imply the inclusion of stated
elements but not the exclusion of any other elements.
[0043] Further, throughout the specification, the phrase "on a
plane" means viewing a target portion from the top, and the phrase
"on a cross-section" means viewing a cross-section formed by
vertically cutting a target portion from the side.
[0044] The present inventive concept relates to a method for
attaching a film to a rear surface of a cover window and to a pad
used in an attaching process, and more particularly, to a method
for effectively attaching a film to a cover window of which all
four sides are curved.
[0045] Hereinafter, a pad according to an exemplary embodiment of
the present inventive concept will be described with reference to
the accompanying drawings.
[0046] FIG. 1 illustrates a pad 1000 according to an exemplary
embodiment of the present inventive concept.
[0047] Referring to FIG. 1, the pad 1000 according to the exemplary
embodiment of the present inventive concept includes a flat portion
1100 and corner portions 1200 respectively positioned at corners of
the pad.
[0048] In the present inventive concept, the pad 1000 is a
structure used to attach a film or the like to a rear surface of a
cover glass, and applies pressure to attach the film to the cover
glass. A shape of the pad 1000 may be similar to that of the cover
glass.
[0049] In the present exemplary embodiment, the flat portion 1100
and the corner portion 1200 of the pad 1000 may have different
hardnesses. That is, the hardness of the corner portion 1200 may be
greater than that of the flat portion 1100. For example, Shore
Hardness of the corner portion may be 1.1 to 7 times greater than
that of the flat portion. In addition, Shore Hardness difference
between the flat portion 1100 and the corner portion 1200 may be
about 10 to 30. For example, the Shore Hardness of the flat portion
1100 may be 5 to 25, and the Shore Hardness of the corner portion
1200 may be 25 to 35. The flat portion 1100 and the corner portion
1200 may contain different materials. As such, since the corner
portion 1200 of the pad 1000 has relatively greater hardness, when
pressure is applied to the entire pad 1000 to attach the film to
the cover glass, stronger pressure may be applied to the film
contacting the corner portion.
[0050] The Shore Hardness (Hs) is a hardness value measured by a
Shore Hardness tester. The Shore Hardness tester is a dynamic
hardness tester, which measures hardness as a height at which a
scale weight with diamond collides with a specimen to bounce after
dropping the scale weight from a predetermined height. The Shore
Hardness H.sub.s is expressed as H.sub.s=10000h/65h.sub.0, wherein
h is a height of the scale weight that bounces, and h.sub.0 is a
height of the scale weight that drops.
[0051] When the film is attached to the rear surface of the cover
glass of which sides are curved, compressive deformation and
tensile deformation of the film occur during the attaching process.
This deformation indispensably occurs in the process of attaching a
flat film to a three-dimensional curved surface. This deformation
is caused even when opposite edges of the cover glass are curved,
but is more seriously caused when all four sides of the cover glass
are curved. When all four sides of the cover glass are curved, it
means that the four edges of the cover glass are not parallel to
the flat portion.
[0052] FIG. 2 illustrates a cover glass 2000 of which all four
sides are curved according to an exemplary embodiment of the
present inventive concept. Referring to FIG. 2, all four edges of
the cover glass 2000 according to an exemplary embodiment of the
present inventive concept are curved. FIG. 3 illustrates a
cross-sectional view taken along line A-A' of the cover glass of
FIG. 2, and FIG. 4 illustrates a cross-sectional view taken along
line B-B' of the cover glass of FIG. 2.
[0053] Referring to FIG. 2 to FIG. 4, it can be seen that the edges
of the cover glass 2000 are bent. Referring to FIG. 3 and FIG. 4,
in A-A' and B-B' cross-sections of FIG. 2, the bent angles at which
the edges of the cover glasses are bent may be different from each
other. That is, in the cross-section as shown in FIG. 3, the edge
of the cover glass is gently bent, and in the cross-section as
shown in FIG. 4, the edge of the cover glass may be steeply bent.
However, the present inventive concept is not limited thereto, and
in the A-A' cross-section, the edge of the cover glass may be
steeply bent, and in the B-B' cross-section, the edge of the cover
glass may be gently bent. Alternatively, in the A-A' and B-B'
cross-sections, the edges of the cover glass may be bent to have
the same angle.
[0054] Referring to FIG. 2, the areas indicated by C in the cover
glass 2000 of FIG. 2 may have multiple curvatures. In the present
specification, the multiple curvatures means that curvatures vary
depending on positions. That is, the structure having the multiple
curvatures is a structure in which multiple curvatures are included
in one curved surface, and curvatures at respective corners are not
the same and are varied. This is because the cover glass 2000 is
bent not only in right and left sides, but in four sides. The
multiple curvatures are caused at the four corners where the
bending in the horizontal direction and the bending in the vertical
direction meet.
[0055] In the exemplary embodiment, the edges in the left and right
directions and the edges in the up and down directions of the cover
glass 2000 may have the multiple curvatures. That is, the edges in
the left and right directions may be bent with the multiple
curvatures with respect to the flat portion, and the edges in the
up and down directions may also be bent with the multiple
curvatures with respect to the flat portion. In this case, since
curvatures in different directions meet at the corner portions,
different degrees of the curvatures may increase depending on the
positions of the corner portions.
[0056] It is not easy to attach the film to the rear surface of the
cover glass having such multiple curvatures. The film attached to
the rear surface of the cover glass is a decoration film for
defining the display area of the cover glass, which exposes the
display area of the display device and covers the non-display area.
Such a film has a two-dimensional structure, but the cover glass of
which all four sides are bent has a three-dimensional structure,
thus in a process of attaching the two-dimensional film to the
three-dimensional cover glass, some areas of the film are
compressed and some other areas thereof are stretched. In this
case, the film is not attached well and air bubbles occur.
[0057] FIG. 5 illustrates deformation of a film which occurs during
a process of attaching the film to a cover glass. Referring to FIG.
5, an edge area 100 is one in which compressive deformation occurs,
and an inside area 200 disposed inside of the edge area 100 is one
in which tensile deformation occurs. That is, it can be confirmed
that different compressive/tensile stresses occur in respective
areas of the film in the process of attaching the film to the cover
glass.
[0058] In order to attach the film to the corners of the cover
glass without bubbles, it is necessary to increase pressure applied
to the pad while attaching the film, but when the pressure applied
to the pad is increased, too strong pressure may be applied to a
central portion of the film to cause leakage of an adhesive
disposed between the film and the cover glass. In this case, when
the pressure is increased so that the film is well-attached to the
corners of the cover glass, the adhesive between the cover glass
and the film leaks out, and when the pressure is decreased to a
level from which the adhesive does not leak out, the film is not
well-attached to the corners of the cover glass.
[0059] However, the pad according to the exemplary embodiment of
the present inventive concept includes the flat portion 1100 and
the corner portion 1200 having different hardnesses. That is, since
the hardness of the corner portion 1200 is greater than the
hardness of the flat portion 1100, a stronger pressure is applied
to the corner portion 1200 even when the film is placed on the pad
and attached to the cover glass with the same pressure.
[0060] Therefore, when the film is attached to the cover glass, it
is possible to prevent the adhesive from leaking out due to the
strong pressure in the planar area, and it is possible to prevent
the bubbles from occurring as a result of the film not being
adhered to the corners of the cover glass.
[0061] FIG. 6 illustrates a pad 1000 according to another exemplary
embodiment of the present inventive concept. FIG. 7 illustrates a
cross-sectional view taken along line VII-VII of the pad of FIG. 6.
Referring to FIG. 6 and FIG. 7, the pad 1000 according to the
present exemplary embodiment is similar to the pad of FIG. 1 in
that it includes a flat portion 1100 and corner portions 1200
respectively positioned at corners of the pad. However, a thickness
of the corner portion 1200 of the pad 1000 according to the
exemplary embodiment of FIG. 6 is thicker than that of the flat
portion 1100. That is, the corner portion 1200 is protruded as
compared with the flat portion 1100. For example, the thickness of
the corner portion may be 1.05 to 1.5 times greater than that of
the flat portion. Alternatively, a height difference between the
flat portion 1100 and the corner portion 1200 may be 0.05 mm to 0.5
mm.
[0062] As such, when the corner portion 1200 is thicker than the
flat portion 1100, even when the film is attached to the cover
glass with the same pressure using the pad 1000, higher pressure is
applied to the protruded corner portion 1200. Therefore, the film
may be well-attached to the four corner portions at which it is
difficult for the cover glass and the film to be attached to each
other. In addition, since the height of the flat portion 1100 is
lower than that of the corner portion 1200, lower pressure is
applied to the flat portion 1100 than the corner portion 1200.
Therefore, it is possible to prevent the adhesive between the cover
glass and the film from leaking out.
[0063] Moreover, in the structure shown in FIG. 6, the hardness of
the corner portion 1200 may be greater than that of the flat
portion 1100. In this case, since the pressure increase due to the
height difference of the corner portions 1200 and the pressure
increase due to the greater hardness of the corner portions 1200
are summed, the film may be strongly attached to the corner
portions of the cover glass.
[0064] That is, in the pad 1000 according to the exemplary
embodiment of the present inventive concept, by forming the pad
1000 so that the hardness at the corner portion 1200 is greater
than that of the flat portion 1100 or so that the thickness of the
corner portion 1200 is greater than that of the flat portion 1100,
the pressure applied to the flat portion 1100 and the corner
portion 1200 of the pad may be made different. Even when the same
pressure is applied to the pad 1000 having such a structure, higher
pressure is applied to the corner portion 1200, and therefore, when
the film is attached to the cover glass, the problem of the film
not being adhered well to the corner of the cover glass may be
prevented.
[0065] Hereinafter, a film attaching method according to an
exemplary embodiment of the present inventive concept will be
described.
[0066] FIG. 8 to FIG. 12 illustrate film attaching processes
according to an exemplary embodiment of the present inventive
concept.
[0067] Referring to FIG. 8, the pad 1000 is first prepared. As
described above, the pad 1000 may be the pad having the structure
shown in FIG. 1 or FIG. 5. When the pad 1000 has the structure
shown in FIG. 1, the hardness of the corner portion 1200 is greater
than that of the flat portion 1100, and when the pad 1000 has the
structure shown in FIG. 5, the thickness of the corner portion 1200
is greater than that of the flat portion 1100. Although the case in
which the pad has the structure of FIG. 1 is exemplarily described
in the present exemplary embodiment, the present inventive concept
is equally applicable to the case in which the pad has the
structure of FIG. 5.
[0068] Referring to FIG. 9, the cover glass 2000 is disposed on the
pad 1000, and a film 3000 is disposed between the cover glass 2000
and the pad 1000. Only the cover glass 2000 is shown in FIG. 8, but
the cover glass 2000 may be fixed and supported by another
structure. The cover glass 2000 may have a curved surface of which
all four sides are bent. That is, the cover glass 2000 may have the
structure shown in FIG. 2. As such, four corners of the cover glass
2000 of which all four edges are bent, as shown in FIG. 2, have
multiple curvatures.
[0069] The film 3000 may be a film which defines a display area and
a non-display area of the display device. FIG. 10 illustrates a
film 3000 according to an exemplary embodiment of the present
inventive concept. Referring to FIG. 10, the film 3000 includes a
display area 3100 and a non-display area 3200.
[0070] Referring to FIG. 11, the film 3000 is attached to the rear
surface of the cover glass 2000 using the pad 1000. Although not
shown, the adhesive may be disposed between the rear surface of the
cover glass 2000 and the film 3000.
[0071] The pad 1000 is gradually pressed and inflated from a center
thereof such that the film 3000 may be attached to the rear surface
of the cover glass 2000. In this case, since the pad 1000 has the
structure shown in FIG. 1 or FIG. 5, the pad 1000 applies a high
pressure to an area corresponding to the corner portion 1200 of the
pad 1000. Therefore, the film may be well-attached to the four
corners of the cover glass 2000 having the multiple curvatures
without lifting.
[0072] Next, referring to FIG. 12, the pad 1000 is removed. The pad
1000 may be removed by reducing the pressure in the inflated pad
1000 to reduce the volume thereof.
[0073] Hereinafter, a display device according to an exemplary
embodiment of the present inventive concept will be described. FIG.
13 illustrates a display device according to an exemplary
embodiment of the present inventive concept. Referring to FIG. 13,
the display device according to the exemplary embodiment of the
present inventive concept includes a display panel 4000 and the
cover glass 2000 positioned on the display panel.
[0074] FIG. 14 illustrates only the cover glass 2000. Referring to
FIG. 14, the film 3000 is attached to the rear surface of the cover
glass 2000. The film 3000 includes the display area 3100 and the
non-display area 3200, and the display area 3100 corresponds to an
opening of the film 3000.
[0075] FIG. 15 illustrates a cross-sectional view of the cover
glass of FIG. 14 in a first direction. FIG. 16 illustrates a
cross-sectional view of the cover glass of FIG. 14 in a second
direction.
[0076] Referring to FIG. 15 and FIG. 16, the cover glass according
to the exemplary embodiment of the present inventive concept
includes the curved surface of which all four sides are bent. That
is, the edges of the cover glass are bent in four directions,
respectively.
[0077] Referring to FIG. 15, the cover glass may have a bent angle
(.theta..sub.1) of more than 90 degrees. That is, as shown in FIG.
15, the angle (.theta..sub.1) formed by one edge of the cover glass
with respect to an imaginary vertical line perpendicular to the
flat portion of the cover glass may be 90 degrees or more. It is
not easy to attach the film to the rear surface of the cover glass
in which the edge is bent at 90 degrees or more. However, when the
pad 1000 according to the exemplary embodiment of the present
inventive concept and the film attaching method using the pad 1000
are used, the film may be well-attached even to the corner of the
cover glass having the multiple curvatures.
[0078] Referring to FIGS. 15 and 16, the angle (.theta..sub.1) at
which the cover glass is bent in a first direction and the angle
(.theta..sub.2) at which the cover glass is bent in a second
direction may be the same or different from each other. However, at
least one of the first direction and the second direction may
include an obtuse angle curved surface.
[0079] As described above, in the pad 1000 according to the
exemplary embodiment of the present inventive concept, by forming
the pad 1000 so that the hardness of the corner portion 1200 is
greater than that of the flat portion 1100 or so that the thickness
of the corner portion 1200 is greater than that of the flat portion
1100, the pressure applied to the flat portion 1100 and the corner
portion 1200 of the pad may be made different. Therefore, the film
3000 may be well-attached to the corners of the cover glass 2000
having the multiple curvatures without lifting and without causing
the adhesive to leak out.
[0080] While this inventive concept has been described in
connection with what is presently considered to be practical
exemplary embodiments, it is to be understood that the inventive
concept is not limited to the disclosed embodiments, but, on the
contrary, is intended to cover various modifications and equivalent
arrangements included within the spirit and scope of the appended
claims.
* * * * *